#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2023, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

# mvds host:remote_system_ds/disk.i fe:SOURCE snapid vmid dsid
#   - fe is the front-end hostname
#   - SOURCE is the path of the disk image in the form DS_BASE_PATH/disk
#   - host is the target host to deploy the VM
#   - remote_system_ds is the path for the system datastore in the host
#   - vmid is the id of the VM
#   - dsid is the target datastore (0 is the system datastore)
#   - snapid is the snapshot id. "-1" for none

SRC=$1
DST=$2
SNAP_ID=$3
VMID=$4

if [ -z "${ONE_LOCATION}" ]; then
    TMCOMMON=/var/lib/one/remotes/tm/tm_common.sh
else
    TMCOMMON=$ONE_LOCATION/var/remotes/tm/tm_common.sh
fi

DRIVER_PATH=$(dirname $0)

. $TMCOMMON
. ${DRIVER_PATH}/../../etc/vmm/kvm/kvmrc

#-------------------------------------------------------------------------------
# Get Image information
#-------------------------------------------------------------------------------

DISK_ID=$(basename ${SRC} | cut -d. -f2)

XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"

unset i j XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <(onevm show -x $VMID| $XPATH \
                    /VM/DEPLOY_ID \
                    /VM/LCM_STATE \
                    /VM/TEMPLATE/DISK\[DISK_ID=$DISK_ID\]/TARGET \
                    /VM/TEMPLATE/DISK\[DISK_ID=$DISK_ID\]/FORMAT \
                    /VM/HISTORY_RECORDS/HISTORY\[last\(\)\]/VM_MAD)

DEPLOY_ID="${XPATH_ELEMENTS[j++]}"
LCM_STATE="${XPATH_ELEMENTS[j++]}"
DISK_TARGET="${XPATH_ELEMENTS[j++]}"
FORMAT="${XPATH_ELEMENTS[j++]}"
VM_MAD="${XPATH_ELEMENTS[j++]}"

#-------------------------------------------------------------------------------
# Set dst path and dir
#-------------------------------------------------------------------------------
SRC_PATH=$(arg_path $SRC)
SRC_HOST=$(arg_host $SRC)

DST_ARG_PATH=$(arg_path $DST)

SRC_DS_PATH="$(dirname "$(dirname "$(dirname "$SRC_PATH")")")"
DST_DS_PATH="$(dirname "$(dirname "$DST_ARG_PATH")")"

DST_PATH="${SRC_DS_PATH}${DST_ARG_PATH##$DST_DS_PATH}"

if [ "$SNAP_ID" != "-1" ]; then
    SRC_PATH="$SRC_PATH.snap/$SNAP_ID"
fi

#-------------------------------------------------------------------------------
# Move the image back to the datastore
#-------------------------------------------------------------------------------
if [ "${LCM_STATE}" = '26' ] && [ "${VM_MAD}" != "kvm" ]; then
    error_message "cpds: Live operation not supported on ${VM_MAD}"
    exit 1
fi

if [ "$FORMAT" = "qcow2" ]; then
    CP_CMD="$QEMU_IMG convert \${SRC_PATH} -O qcow2 $DST_PATH"
else
    CP_CMD="cp -f $SRC_PATH $DST_PATH"
fi

# For current image of the running VMs, don't touch the image directly,
# but export the content via blockcopy. If that's not possible (old QEMU),
# domfsfreeze or suspend the domain before.
if [ "${LCM_STATE}" = '26' ] && [ "${SNAP_ID}" = '-1' ]; then
    FREEZE_CP_CMD=$(cat <<EOF
touch ${DST_PATH}
if ! virsh -c ${LIBVIRT_URI} blockcopy ${DEPLOY_ID} ${DISK_TARGET} ${DST_PATH} --wait --finish; then
    if timeout ${VIRSH_TIMEOUT:-60} virsh -c ${LIBVIRT_URI} domfsfreeze ${DEPLOY_ID}; then
        trap "virsh -c ${LIBVIRT_URI} domfsthaw ${DEPLOY_ID}" EXIT
    elif virsh -c ${LIBVIRT_URI} suspend ${DEPLOY_ID}; then
        trap "virsh -c ${LIBVIRT_URI} resume ${DEPLOY_ID}" EXIT
    else
        echo "Could not domfsfreeze or suspend domain" >&2
        exit 1
    fi

    ${CP_CMD}
fi
EOF
)
else
    FREEZE_CP_CMD="$CP_CMD"
fi

CPDS_CMD=$(cat <<EOF
set -e -o pipefail

if [ -f "${SRC_PATH}.current" ]; then
    SRC_PATH=\$(cat ${SRC_PATH}.current)
else
    SRC_PATH="${SRC_PATH}"
fi

SRC_READLN=\$($READLINK -f \${SRC_PATH})
DST_READLN=\$($READLINK -f $DST_PATH)

if [ \( -L \${SRC_PATH} \) -a \( "\$SRC_READLN" = "\$DST_READLN" \) ] ; then
    echo "Not moving files to image repo, they are the same"
else
    ${FREEZE_CP_CMD}
fi
EOF
)

log "Copying $SRC_PATH to datastore as $DST_PATH"

ssh_exec_and_log $SRC_HOST "$CPDS_CMD" "Could not move image $DST_PATH"

exit 0
